ASTM F1837M-97(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F1837M −97(Reapproved 2007) An American National Standard
Standard Specification for
Heat-Shrink Cable Entry Seals (Metric)
This standard is issued under the fixed designation F1837M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope tive Density) of Plastics by Displacement
D2240 Test Method for Rubber Property—Durometer Hard-
1.1 This specification covers the general requirements for
ness
heat-shrink cable entry seals. Cable entry seals are intended for
D2671 Test Methods for Heat-Shrinkable Tubing for Elec-
making electrical cable penetrations into connection boxes,
trical Use
bulkheads, or other enclosures. These devices are suitable for
D2863 Test Method for Measuring the Minimum Oxygen
both thin wall enclosures up to 5 mm ( ⁄16 in.) thick and
Concentration to Support Candle-Like Combustion of
3 3
thick-wallenclosuresof5mmto19mm( ⁄16in.to ⁄4in.)thick.
Plastics (Oxygen Index)
1.2 Cable entry seals shall have factory-applied adhesive
D3149 Specification for Crosslinked Polyolefin Heat-
that provides the seal to wire and cable jackets.
Shrinkable Tubing for Electrical Insulation
1.3 The values stated in SI units are to be regarded as the D4572 Test Method for Rubber Chemicals—Wet Sieve
Analysis of Sulfur
standard. The values given in parentheses are for information
only. D4732 Specification for Cool-Application Filling Com-
pounds for Telecommunications Wire and Cable
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 2.2 ASME Standard
ASME B1.1 Unified Inch Screw Threads (UN and UNR
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- Thread Form)
bility of regulatory limitations prior to its use.
2.3 NEMA Standards:
NEMA250 Enclosures for Electrical Equipment (1000Volts
2. Referenced Documents
Max)
2.1 ASTM Standards:
2.4 IEC Standard:
D149 Test Method for Dielectric Breakdown Voltage and
IEC 68-2-6 Environmental Testing–Part 2: Tests–Test FC:
DielectricStrengthofSolidElectricalInsulatingMaterials
Vibration (Sinusoidal) Sixth Edition
at Commercial Power Frequencies
D257 Test Methods for DC Resistance or Conductance of
3. Terminology
Insulating Materials
3.1 Definitions of Terms Specific to This Standard:
D412 Test Methods forVulcanized Rubber andThermoplas-
3.1.1 heat-shrink cable entry seal, n—heat-shrinkable tube
tic Elastomers—Tension
making a watertight, fume-tight seal where cable connections
D570 Test Method for Water Absorption of Plastics
boxes, bulkheads, or other enclosures.
D635 Test Method for Rate of Burning and/or Extent and
3.1.2 polyolefin, n—a polymer made by the polymerization
Time of Burning of Plastics in a Horizontal Position
of hydrocarbon olefins or copolymerization olefins.
D747 Test Method for Apparent Bending Modulus of Plas-
tics by Means of a Cantilever Beam
4. Classification
D792 Test Methods for Density and Specific Gravity (Rela-
4.1 Heat-shrink cable entry seals shall be of the following
types:
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technologyand is the direct responsibility of Subcommittee F25.10 on
Electrical.
Current edition approved May 1, 2007. Published June 2007. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1997. Last previous edition approved in 2002 as F1837M - 97(2002). International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
DOI: 10.1520/F1837M-97R07. www.asme.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from National Electrical Manufacturers Association (NEMA), 1300
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM N. 17th St., Suite 1752, Rosslyn, VA 22209, http://www.nema.org.
Standards volume information, refer to the standard’s Document Summary page on Available from International Electrotechnical Commission (IEC), 3, rue de
the ASTM website. Varembe, Case Postale 131, CH-1211, Geneva 20, Switzerland.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1837M−97 (2007)
4.1.1 Type 1, standard cable entry seals for thin-wall enclo- 6.2 The heat-shrinkable tubing shall be of a crosslinked
sures shall consist of the three part assembly; a rigid plastic polyolefin in accordance with Type III of Specification D3149.
nut, O-ring, and heat-shrinkable molded area.
6.3 The adhesive shall be general purpose high-bond-
4.1.1.1 Type I–1, molded area configured with one opening
strength adhesive sealant that provides stain relief and envi-
for a single wire or cable entry.
ronmental sealing of heat-shrink tubing to cable jackets.
4.1.1.2 Type I–2, molded area configured with two equal
6.4 O-rings shall be made of a material conforming to Type
size openings to seal two wires or cables.
II of Specification D4732.
4.1.1.3 Type I–3, molded area configured with three equal
size openings to seal three wires or cables.
6.5 The polyolefin heat-shrinkable tubing shall met require-
4.1.1.4 Type I–4, molded area configured with four equal ments of Test Methods D2671.
size openings to seal four wires or cables.
7. Other Requirements
4.1.1.5 Type I–5, molded area configured with six equal size
openings to seal six wires or cables.
7.1 Dimensional Requirements—Cable-entry seals shall
4.1.1.6 Type I–6, molded area configured with eight equal
conform to the dimensional requirements of Tables 1-6. Type I
size openings to seal eight wires or cables.
cable-entry seals are presented in Fig. 1 and Fig. 2. Type II
4.1.2 Type II, cable entry seal for threaded hole applications
cable-entrysealsarepresentedinFig.3andFig.4.Right-angle
shall consist of a one-part assembly that combines a tapered
cable-entry seals (Types III and IV) are presented in Fig. 5 and
national pipe thread (NPT) in rigid plastic with heat-shrinkable
Fig. 6.
molded area.
7.2 Performance Requirements:
4.1.2.1 Type II–1, molded area configured with one opening
7.2.1 Vibration Resistance—When cable-entry seals are
for a single wire or cable entry.
testedasspecifiedin9.1,thereshallbenoevidenceofcracking
4.1.2.2 Type II–2, molded area configured with two equal
or loosening of parts.
size openings to seal two wires or cables.
7.2.2 Ruggedness—When cable-entry seals are subjected to
4.1.2.3 Type II–3, molded area configured with three equal
a mechanical abuse test as specified in 9.2, there shall be no
size openings to seal three wires or cables.
cracking, breaking, distortion, or damage to the sample.
4.1.2.4 Type II–4, molded area configured with four equal
7.2.3 Effectiveness of seal—When cable-entry seals are
size openings to seal four wires or cables.
tested as specified in 9.3, there shall be no evidence of leakage
4.1.3 Type III, right angle cable entry seal for thin-wall
through or around the cable entry seals.
enclosure shall consist of a three part assembly; a rigid plastic
nut, O-ring, and heat-shrinkable molded area.
8. Workmanship, Finish, and Appearance
4.1.4 Type IV, right angle cable entry seal for threaded hole
8.1 Cable-entry seals shall be free from warp, cracks,
application shall consist of a one-part assembly that combines
chipped edges, or surfaces, blisters, uneven surfaces, scratches,
a tapered national pipe thread (NPT) in rigid plastic with a
dents, and flow lines. They shall be free from fins, burrs, and
heat-shrinkable molded area.
from unsightly finish caused by chipping, filling, or grinding
5. Ordering Information without subsequent buffing or polishing.All molded parts shall
cleaned thoroughly of annealing mediums.
5.1 Ordersforcableentrysealsunderthisspecificationshall
include the following:
9. Test Methods
5.1.1 Part Number (see Figs. 1-6).
9.1 Conformance testing of a random sample may be
5.1.2 Quantity (per each part).
requested by the purchaser in order to verify that selected
6. Materials and Manufacture
performance characteristics specified herein have been incor-
porated in the cable-entry seal design and maintained in
6.1 The rigid plastic parts shall be made from polyamide
production.
(nylon), (or polyester material, or both.) The material shall be
9.1.1 Vibration—The cable-entry seals shall be subjected to
Group 1, Class 8, Grade 1 as specified in Specification D4066.
vibration testing as specified in IEC Standard 68-2-6. The
6.1.1 Threads shall be unified form UN 2A or 2B or taper
following details shall apply:
pipe thread (NPT) as specified in ASME B1. 1.
9.1.1.1 Thecable-entrysealsshallbecompletewithO-rings
and 1 to 2-m (3 to 6 ft) lengths of cable of appropriate size.
9.1.1.2 Thefreeendofthecablesshallbesecuredtoprevent
excessive cable whipping action during test.
9.1.1.3 Tests are to be carried out in three perpendicular
planes.
9.1.1.4 Duration of the test for no resonance condition shall
be 90 min at 30 Hz. Duration at each resonance frequency at
which Q>2 is recorded. It is recommended as guidance that Q
does not exceed 5.
9.1.1.5 Testrangeshallbe2 60.3Hzto13.2Hz–amplitude
FIG. 1Type I–Single-Legged Standard Cable Entry Seals 61 mm: 13.2 Hz to 100 Hz–acceleration 67g.
F1837M−97 (2007)
FIG. 2Type I–Multi-Legged Standard Cable Entry Seals
FIG. 3Type II–Single-Legged Threaded Cable Entry Seals
FIG. 4Type II–Multi-Legged Threaded Cable Entry Seals
9.1.1.6 Nonconformance to the requirements of 7.2.1 shall designation (4, 4X, 6, 6P) shall establish the appropriate
be cause for rejection. environmental capability required of the installed cable-entry
seal.
9.2 Mechanical Abuse Test:
9.3.1 Nonconformance to the requirements of 7.2.3 shall be
9.2.1 A mechanical abuse test shall be conducted on the
cause for rejection.
sample cable-entry seal assembled on the end of a 2-m (6-ft)
length of electrical cable of appropriate size.
10. Inspection.
9.2.2 The cable-entry seal shall be allowed to swing on a
10.1 Visual and Dimensional Examination —Samples shall
radius, while suspended by the electrical cable, from a vertical
be examined visually to verify that the materials, design,
surface and strike against a vertical flat steel plate on that
construction, physical dimensions, marking, and workmanship
surface. The vertical distance through which the cable entry
are as specified in the applicable requirements.
seal is allowed to fall shall be 1.5 m (5 ft), and the number of
impacts shall be ten. 11. Certification
9.2.3 The cable-entry seal shall be disassembled and exam-
11.1 Material Certification—Material certification shall be
ined. Nonconformance to the requirements of 7.2.2 shall be
required from the manufacturers of the plastic material and
cause for rejection.
shirk-tubing to ensure the materials were manufactured,
9.3 LevelofEffectiveness—Acompletecable-entrysealwith sampled, tested, and inspected in accordance with Specifica-
O-ring installed and assembled properly and shrunk to a cable tions D4066 and D3149. Material identity traceable to this
or with a plug installed shall conform to the performance certification shall be maintained throughout the manufacturing
requirements of NEMA 250. The NEMA enclosure type process.
F1837M−97 (2007)
FIG. 5Type III–Right-Angle Cable Entry Seals
FIG. 6Type IV–Right-Angle Cable Entry Seals
11.2 When specified in the purchase order or contract, the 13. Packaging Requirements
purchaser shall be furnished certification that samples repre-
13.1 The seals shall be supplied by type as specified in Figs.
sentingeachlothavebeeneithertestedorinspectedasdirected
1-6.
inthisspecificationandtherequirementshavebeenmet.When
specified in the purchase order or contract, a report of the test
13.2 The seals shall be packaged in conformance with good
results shall be furnished.
commercial practice unless otherwise specified. Individual
types and sizes shall be neatly bundled or boxed. The exterior
12. Product Marking
shipping container shall be acceptable by parcel post or
12.1 Each cable-entry seal shall be identified distinctly. The
common carrier.
name of the manufacturer, part number, identification of this
ASTM standard, and other appropriate information shall be
shown thereon.
F1837M−97 (2007)
A
TABLE 1 Type 1—Single Legged Standard Cable Entry Seals
CB A
Tubing
Expanded I.D. Recovered I.D. Overall Nominal
B
(min) (max) I.D. (min) Recovered Recommended Part No.
Length Hole Diameter
13.0 (0.50) 3.0 (0.12) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 1-1
19.0 (0.75) 6.5 (0.25) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 1-2
19.0 (0.75) 6.5 (0.25) 19.0 (0.75) 32.0 (1.25) 25.5 (1.00) CES S 1-3
28.5 (1.20) 13.0 (0.50) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 1-4
35.0 (1.38) 13.0 (0.50) 28.0 (1.10) 95.0 (3.75) 44.5 (1.75) CES S 1-5
40.0 (1.70) 19.0 (0.75) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 1-6
70.0 (2.75) 19.0 (0.75) 53.0 (2.10) 102.0 (4.00) 60.0 (2.36) CES S 1-7
70.0 (2.75) 36.0 (1.43) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 1-8
A
Dimensions shown are nominal and in millimeters (in).
B
Part numbers were established in the following way:
CES—cable entry seal,
S or T—standard or threaded, and
1-1—number preceding hyphen represents number legs; number following hyphen represents size type.
A
TABLE 2 Type 1—Multi-Legged Standard Cable Entry Seals
BA
Multi-Leg Boot
Expanded I.D. Recovered I.D.
Min. Max. Overall Nominal
(Each Leg) (Each Leg) I.D. (min) Recovered Recommended
B
No. of Legs Length Hole Diameter Part No.
2 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 2-1
2 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 2-2
2 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 2-3
3 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 3-1
3 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.01 (1.38) CES S 3-2
3 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 3-3
3 32.0 (1.25) 13.0 (0.50) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 3-4
4 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 4-1
4 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 4-2
4 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 4-3
4 32.0 (1.25) 13.0 (0.50) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 4-4
6 23.0 (0.90) 7.5 (0.30) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 6-1
8 23.0 (0.90) 7.5 (0.30) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 8-1
A
Dimensions shown are nominal and i
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